Patent US5501150A successfully refreshed from Google Patents.
Patent US3538730A successfully refreshed from Google Patents.
US3538730A
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US
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Extrusion method and apparatus
Assignee: National Research Development Corp UK
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Filing: 1967-12-11
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Granted: 1970-11-10
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Expires: 1987-12-11
Abstract
No abstract record available.
Inventors
- 👤 John Malcolm Alexander
- 👤 Bela Lengyel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:23
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/007; B21C23/008; G; G21; G21C; G21C1/00; G21C1/02; G21C1/03; G21C1/30; G21C19/00; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S376/00; Y10S376/91; Y10S376/911
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |